Bad customer service and appliances that are not reliable

On June 2019 I bought a Russel hobbs heater, in October 2019 the switch broke and I took the heater back the fixed it and I fetched it in November,now in December the heater broke again and I took it back, I have asked them for another, voucher or money back they refused. My question now is how many times will I go to Pick n Pay Maponya for repairs? The petrol money that I am using to go back there can buy another heater, now I'm waiting my time and energy for this Rusell hobbs heater. I think it's within my right to get my money back. I am not being treated fairly by Pick n Pay Maponya. They must take their heater back and refund me. It's chilly now my kids are cold at home for What??